9
PROGRAMMING YOUR ST9400C
Exiting HOT WATER Programming Mode:
To exit HOT WATER programming mode, move the slider to the RUN position. This 
can be done at any time during the programming process, and any changes made 
and confirmed with the 
 button will have been saved.
Note: If the unit is left in HOT WATER Programming mode for more than 10 minutes without 
the  slider  being  moved  or  any  buttons  pressed,  the  message  ‘MOVE  SLIDER’  will  be 
displayed.  Press a button to finish programming, or move the slider to the RUN position.
Modifying the Heating Programme
The heating programme has three pairs of ON/OFF switching times per day. Each 
time can be  set  between  3.00  am  and  2.50 am (on the  next  day)  to  allow  you  to 
programme the heating to stay on past midnight, if required. 
a.  Move the slide switch to the HEATING position. ‘SET HEATING’ will show briefly 
to verify this action.
b.  Now follow the same procedure to set the times as described in ‘Modifying the 
Hot Water Programme’ (page 7) steps b. to i.
Exiting HEATING Programming Mode:
To exit HEATING programming mode, move the slider to the RUN position. This can 
be done at any time during the programming process, and any changes made and 
confirmed with the 
 button will have been saved.
Note: If the unit is left in HEATING Programming mode for more than 10 minutes without 
the  slider  being  moved  or  any  buttons  pressed,  the  message  ‘MOVE  SLIDER’  will  be 
displayed.  Press a button to finish programming, or move the slider to the RUN position.
Disabling / Enabling Time Periods (for Heating and/or Hot Water)
To disable any of the time periods ON 1 to OFF 1, ON 2 to OFF 2, or ON 3 to OFF 3, 
simply set the ON time and its paired OFF time to the same time, and the programme 
will just ignore them. 
To re-enable the time period, simply set the two ON and OFF times to be different.
HOT WATER HEATING
DAY/TIME
HOT WATER
HEATING
RUN